US20110007914A1 - Electrostatic loudspeaker - Google Patents
Electrostatic loudspeaker Download PDFInfo
- Publication number
- US20110007914A1 US20110007914A1 US12/571,389 US57138909A US2011007914A1 US 20110007914 A1 US20110007914 A1 US 20110007914A1 US 57138909 A US57138909 A US 57138909A US 2011007914 A1 US2011007914 A1 US 2011007914A1
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- backplate
- metal
- diaphragm
- substrate
- electrostatic loudspeaker
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- 239000002184 metal Substances 0.000 claims abstract description 223
- 229910052751 metal Inorganic materials 0.000 claims abstract description 223
- 239000000758 substrate Substances 0.000 claims abstract description 55
- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 125000006850 spacer group Chemical group 0.000 claims abstract description 22
- 239000010410 layer Substances 0.000 claims description 61
- 239000011229 interlayer Substances 0.000 claims description 22
- 239000012212 insulator Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000005686 electrostatic field Effects 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/04—Structural association of microphone with electric circuitry therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/02—Loudspeakers
Definitions
- the present invention relates to an electroacoustic transducer, and more particularly relates to a small or miniature electrostastic loudspeaker (ESL).
- ESL electrostastic loudspeaker
- Loudspeaker is an electroacoustic transducer for changing electrical signals into sound.
- the loudspeaker pushes a medium in accord with the pulsations of an electrical signal, thus causing sound waves to propagate to where they can then be received by the ear.
- the loudspeakers are divided into many kinds of types, such as magnetic loudspeaker, piezoelectric loudspeaker, electrostatic loudspeaker (condenser loudspeaker) and moving-coil loudspeaker (dynamic loudspeaker).
- Each type of the loudspeaker has advantages and disadvantages. In recent years, the moving-coil loudspeaker has been widely used because of the advantages in relatively great variety and mature manufacturing process.
- the loudspeakers are almost applied in each kind of electrical consumer products.
- the market of the loudspeaker which is recognized as the key part of the consumer products becomes larger and larger.
- the moving-coil loudspeaker takes up a large share of the market.
- the moving-coil loudspeaker has a vibration system and magnetic system.
- the vibration system is operated by the electro-magnetic interaction to produce mechanical movement, and further radiate sound-waves into air.
- the vibration system has a heavy quality which limits the application of the moving-coil loudspeaker in the portable products.
- the frequency response is not flat and has worse performance in high-range frequency.
- the electrostatic loudspeaker mainly has a diaphragm and stationary electrode which forms a capacitor with the diaphragm.
- the electrostatic loudspeaker is driven by the static-electricity on the capacitor to work.
- the capacitor electrically connects with a pair of power sources to polarize the two electrodes, the diaphragm and stationary electrode, to produce an electrostatic field therebetween.
- the diaphragm is driven by the signal currents supplied by the electrostatic field to vibrate and sound, and then radiate sound-waves to exterior through sound apertures located on the stationary electrode.
- the electrostatic loudspeaker adopts the static-driven vibration system which is light and thin without the coils and the like elements in the moving-coil loudspeaker. Therefore, the electrostatic loudspeaker can expand the high frequency characteristic, and meanwhile improve the flatness of the frequency response.
- the electrostatic loudspeaker also has an advantage of small distortion. Conclusively, the structure of the electrostatic loudspeaker is easy to be small-sized and light, and is in accordance with the development trend of electrical consumer products.
- an electrostatic loudspeaker includes: a backplate having a metal film acting as one electrode of a capacitor and defining a plurality of sound apertures therein; a diaphragm spaced a distance from the backplate insulatively to form the capacitor; the diaphragm comprising a metal film acting as the other electrode of the capacitor; a back chamber having a substrate and an insulative spacer for joining edge portions of the diaphragm and the substrate; a driving circuit element for converting electrical signals from exterior input pads into driving signals to drive the diaphragm to vibrate and sound; the driving circuit element being mounted on an inner surface of the substrate and being accommodated in the back chamber; and a first, second and third connection paths for respectively electrically connecting the driving circuit element with the two electrodes of the capacitor, and the exterior input pads.
- an electrostatic loudspeaker includes: a first and second backplates each having a metal film; a diaphragm being sandwiched between the first and second backplates and having a metal film which forms a first capacitor with the metal film of the first backplate and forms a second capacitor with the metal film of the second backplate; the metal films of the first and second backplates being applied inverse voltage when the electrostatic loud speaking working; a substrate being located below the diaphragm; a driving circuit element being mounted on the substrate for converting electrical signals from exterior input pads into driving signal to drive the diaphragm to vibrate and sound; a plurality of connection paths respectively for electrically connecting the driving circuit element with the metal films of the first backplate, the second backplate and diaphragm, and the exterior input pads; and a shielding case enclosing the connection paths therein.
- an electrostatic loudspeaker includes: first and second backplates each having a metal film; a diaphragm being sandwiched between the first and second backplates and having a metal film which forms a first capacitor with the metal film of the first backplate and forms a second capacitor with the metal film of the second backplate; a back chamber having a substrate and an insulative spacer for joining edge portions of the second backplate and the substrate; the substrate having a first metal layer which is formed on an inner surface of the substrate and divided into several separate parts being electrically insulative to each other; a driving circuit element for converting electrical signals into driving signals to drive the diaphragm to vibrate and sound; the driving circuit element being mounted on the inner surface of the substrate and being accommodated in the back chamber; a plurality of metal connection posts extending through the diaphragm, the second backplate, the insulative space and the substrate; the metal connection posts of the diaphragm, the second backplate, and the insulative space electrical
- FIG. 1 is a schematic perspective view of an electrostatic loudspeaker according to a first embodiment of the present invention
- FIG. 2 is a cross-sectional view of the electrostatic loudspeaker shown in FIG. 1 ;
- FIG. 3 is a schematic cross-sectional view of an electrostatic loudspeaker according to a second embodiment of the present invention.
- FIG. 4 is a schematic cross-sectional view of an electrostatic loudspeaker according to a third embodiment of the present invention.
- the electrostatic loudspeaker has a backplate 1 , a diaphragm 3 , an insulator 2 , an insulative spacer 4 , a substrate 5 , a plurality of metal wires 7 and a plurality of metal connection posts.
- the backplate 1 , the insulative spacer 4 and the substrate 5 are mainly formed by insulative materials, such as FR-4, G10, BT.
- the backplate 1 opens a plurality of sound apertures 1 a through which sound waves are radiated to exterior when the diaphragm 3 being driven to vibrate and sound. Further, the size, amount, shape and arrangement of the sound apertures 1 a are determined depending on the acoustic characteristic requirements, for example, the sound apertures 1 a can be shaped in round or rectangle.
- the backplate 1 has the base material and a metal film 1 b .
- the metal film 1 b is formed on an inner surface of the backplate 1 .
- the diaphragm 3 has a base film and a metal film 3 b , and the base film is formed by organic film, such as PTE, PE, PVC, PTFE.
- the insulator 2 is located between the backplate 1 and the diaphragm 3 for connecting and supporting the edge portions thereof to make sure that the backplate 1 and the diaphragm 3 are electrically insulated to each other. In such configuration, a capacitor is formed and the metal film 1 b of the backplate 1 and the metal film 3 b of the diaphragm 3 act as two electrodes of the capacitor.
- the diaphragm 3 further has a metal connection post 3 a extending vertically through upper and lower surfaces thereof.
- One side wall of the insulator 2 also has a metal connection post 2 a which extends vertically through upper and lower surfaces thereof to electrically connect with the metal connection post 3 a of the diaphragm 3 .
- the insulative spacer 4 is opposite to the backplate 1 and peripherally connects the diaphragm 3 with substrate 5 to form a back chamber which is acoustic airtight.
- a driving circuit element 6 is mounted on the substrate 5 and is accommodated by the back chamber.
- the electrostatic loudspeaker not only can effectively adjust the acoustic characteristic but also can achieve a small-size because of the structure of back chamber.
- two opposite side walls of the insulative spacer 4 respectively have a metal connection post 4 a and 4 a 1 extending through upper and lower surfaces thereof.
- the metal connection post 4 a 1 is electrically connected with the metal connection post 3 a of the diaphragm 3
- the metal connection post 4 a is electrically connected with the metal film 3 b of the diaphragm 3 .
- the substrate 5 has a first metal layer 5 a which is located on the inner (upper) surface thereof and a second metal layer 5 b which is located on the outer (lower) surface thereof.
- the second metal layer 5 b has several pads some of which function as exterior input pads of the whole electrostatic loudspeaker.
- the substrate 5 further has a plurality of metal connection posts 5 c extending through the upper and lower surfaces thereof to establish an electrical connection between the first metal layer 5 a and the second metal layer 5 b.
- the driving circuit element 6 is mounted on the upper surface of the substrate 5 and establishes an electrical connection with the first metal layer 5 a via the metal wires 7 a , 7 b , 7 c and 7 d .
- Connection parts of the first metal layer 5 contacting with the metal wires 7 a , 7 b , 7 c and 7 d are respectively defined as a first part, a second part and a third part (the connection parts contacting with the metal wiring 7 c and 7 d are jointly defined as the third part).
- the driving circuit element 6 When electrical signals are inputted through the exterior pads of the second metal layer 5 b , the metal connection posts 5 c , the third part of the first metal layer 5 a and the metal wires 7 b , 7 d (one connection path), the driving circuit element 6 receives the input electrical signals and converts them into driving signals.
- One road of the driving signals are transmitted through the metal wire 7 a , the first part of the first metal layer 5 a , the metal connection post 4 a 1 of the insulative spacer 4 , the connection post 3 a of the diaphragm 3 , the connection post 2 a (another connection path) and finally get to the metal film 1 b of the backplate 1 ;
- the other road of the driving signals are transmitted through the metal wire 7 c , the second part of the first metal layer 5 a , the connection post 4 a of the insulative spacer 4 (the other connection path) and finally get to the metal film 3 b of the diaphragm 3 .
- the two electrodes (the backplate 1 and diaphragm 3 ) respectively establish an electrical connection with the driving circuit element 6 .
- the two electrodes are polarized to produce an electrostatic filed to drive the diaphragm 3 to vibrate and sound.
- the sound is radiated out through the sound apertures 1 a .
- the function of the electrostatic loudspeaker is wholly achieved.
- the electrostatic loudspeaker of the second embodiment Comparing to the first embodiment of the present invention, the electrostatic loudspeaker of the second embodiment further has a shielding case to prevent connections paths from the electromagnetic interference.
- the electrostatic loudspeaker has a backplate 1 , a diaphragm 3 , an insulator 2 , a insulative spacer 4 , a substrate 5 , the shielding case, a plurality of metal wires 7 and a plurality of metal connection posts.
- the backplate 1 , the insulative spacer 4 and the substrate 5 are mainly formed by insulative materials, such as FR-4, G10, BT.
- the backplate 1 opens a plurality of sound apertures 1 a through which sound waves are radiated to exterior when the diaphragm 3 being driven to vibrate and sound. Further, the size, amount, shape and arrangement of the sound apertures 1 a are determined depending on the acoustic characteristic requirements, for example, the sound apertures 1 a can be shaped in round or rectangle.
- the backplate 1 has the base material and a metal film 1 b .
- the metal film 1 b is formed on an inner surface of the backplate 1 .
- the diaphragm 3 has a base film and a metal film 3 b , and the base film is formed by organic film, such as PTE, PE, PVC, PTFE.
- the insulator 2 is located between the backplate 1 and the diaphragm 3 for connecting and supporting the edge portions thereof to make sure that the backplate 1 and the diaphragm 3 are electrically insulated to each other. In such configuration, a capacitor is formed and the metal film 1 b of the backplate 1 and the metal film 3 b of the diaphragm 3 act as two electrodes of the capacitor.
- the backplate 1 further has a metal shielding layer 1 c covering an upper (outer) surface thereof and a metal shielding interlayer 1 d which extends through the upper and lower surfaces thereof to electrically connect with the metal shielding layer 1 c .
- the metal film 1 b and the metal shielding layer 1 c can be made of cuprum, aurum, nickel or the like materials.
- the diaphragm 3 further has a metal connection post 3 a extending vertically through upper and lower surfaces thereof.
- One side wall of the insulator 2 also has a metal connection post 2 a which extends vertically through upper and lower surfaces thereof to electrically connect with the metal connection post 3 a of the diaphragm 3 .
- the diaphragm 3 further has a metal shielding interlayer 3 c.
- the insulator 2 has a metal shielding interlayer 2 b which extends vertically through upper and lower surfaces thereof to electrically connect with the metal shielding interlayer 3 c and the metal shielding interlayer 1 d . Furthermore, the metal shielding interlayer 2 b should be located outside of the metal connection post 2 a.
- the insulative spacer 4 is opposite to the backplate 1 and peripherally connects the diaphragm 3 with the substrate 5 to form a back chamber which is acoustic airtight.
- a driving circuit element 6 is mounted on the substrate 5 and is accommodated by the back chamber.
- the electrostatic loudspeaker not only can effectively adjust the acoustic characteristic but also can achieve a small-size because of the structure of back chamber.
- connection post 4 a and 4 a 1 are electrically connected with the connection post 3 a of the diaphragm 3
- the connection post 4 a is electrically connected with the metal film 3 b of the diaphragm 3 .
- the substrate 5 has a first metal layer 5 a which is located on inner the (upper) surface thereof, a second metal layer 5 b which is located on the outer (lower) surface thereof and a plurality of metal connection posts 5 c establishing an electrical connection between the first metal layer 5 a and the second metal layer 5 b .
- the driving circuit element 6 is mounted on the upper surface of the substrate 5 and establishes an electrical connection with the first metal layer 5 a via the metal wires 7 a , 7 b , 7 c , 7 d , 7 e and 7 f .
- the second metal layer 5 b is graphically divided into a plurality of electrode pads 5 d , 5 e , 5 f , 5 g etc, wherein the electrode pad 5 d and 5 g are defined as grounding pads.
- the metal wire 7 a electrically connects with the first metal layer 5 a , the metal connection posts 4 a 1 , 3 a and 2 a to establish a first connection path.
- the metal wire 7 f electrically connects with the first metal layer 5 a and the metal connection post 4 a to establish a second connection path.
- the metal wires 7 c and 7 d electrically connects with the first metal layer 5 a and the connection posts 5 c to establish a third connection path.
- the driving circuit element 6 converts the electrical signals into driving signals.
- One road of the driving signals gets to the metal film 1 b of the backplate 1 via the first connection path.
- the other road of the driving signals gets to the metal film 3 b of the diaphragm 3 via the second connection path.
- the two electrodes (the backplate 1 and diaphragm 3 ) respectively establish electrical connection with driving circuit element 5 .
- the two electrodes are polarized to produce an electrostatic filed to drive the diaphragm 3 to vibrate and sound.
- the sound is radiated out through the sound apertures 1 a .
- the metal shielding layer 1 c , the metal shielding interlayer 1 d , 2 b , 3 c and 4 b , the second metal layer 5 b (the grounding pads 5 d and 5 g ), some of the metal connection posts 5 c and the metal wires 7 b , 7 e are electrically connected together and jointly forms into the shielding case which encloses substantial parts or elements of the electrostatic loudspeaker to prevent them from exterior interference.
- the electrostatic loudspeaker has a first backplate 1 , a diaphragm 3 , a first insulator 2 , an insulative spacer 4 , a substrate 5 , and a driving circuit element 6 , a plurality of metal wires 7 , a second backplate 8 , a second insulator 9 , a shielding case, and a plurality of metal connection posts.
- the first backplate 1 is the same as the backplate 1 in the first and second embodiments. Using the different term to indicate the same part is not intended to confuse the skilled person in this art, but conveniently describe the third embodiment of the present invention.
- the diaphragm 3 is sandwiched between the first backplate 1 and the second backplate 2 .
- the first backplate 1 and the second backplate 2 are applied inverse voltage so that they seldom adhesively contacts with the diaphragm 3 with the radiated sound power is improved.
- the first backplate 1 , the second backplate 8 , the first insulator 2 , the second insulator 9 , the insulative spacer 4 and the substrate 5 are mainly formed by insulative materials, such as FR-4, G10, BT.
- Both of the backplates 1 , 8 open a plurality of sound apertures 1 a , 8 a through which sound waves are radiated to exterior when the diaphragm 3 being driven to vibrate and sound.
- the size, amount, shape and arrangement of the sound apertures 1 a , 8 a are determined depending on the acoustic characteristic requirements, for example, the sound apertures 1 a , 8 a can be shaped in round or rectangle.
- the first backplate 1 has a first metal film 1 b which formed on an inner surface of the first backplate 1 .
- the first metal film 1 b is the same as the metal film 1 b in the first and second embodiments.
- the first backplate 1 further has a metal shielding layer 1 c covering an upper (outer) surface thereof and a metal shielding interlayer 1 d which extends through the upper and lower surfaces thereof to electrically connect with the metal shielding layer 1 c .
- the metal film 1 b and the metal shielding layer 1 c can be made of cuprum, aurum, nickel or the like materials.
- the second backplate 8 has a second metal film 8 a which is formed on an upper surface thereof.
- the first and second metal films 1 a , 8 a are applied inverse voltage, and they corporately drive the diaphragm 3 to vibrate and sound in a higher driving power and fewer adhesive contacts among them.
- the second backplate 8 further has a metal shielding interlayer 8 b and metal connection posts 8 c and 8 d , wherein the connection post 8 d electrically contact with the second metal film 8 a.
- the diaphragm 3 has a base film, a metal film 3 b , a metal connection post 3 a extending vertically through upper and lower surfaces thereof and a metal shielding interlayer 3 c .
- the base film is formed by organic film, such as PTE, PE, PVC and PTFE.
- the first insulator 2 is located between the first backplate 1 and the diaphragm 3 for connecting and supporting the edge portions thereof to make sure that the first backplate 1 and the diaphragm 3 are electrically insulated to each other.
- the first insulator 2 has a metal connection post 2 a which extends vertically through upper and lower surfaces thereof to electrically connect with the metal connection post 3 a , and a metal shielding interlayer 2 b which is substantially parallel to the metal connection post 2 a and extends beyond the upper and lower surfaces thereof to electrically connect with the metal shielding interlayer 3 c and the metal shielding layer 1 d . Furthermore, the metal shielding interlayer 2 b should be located outside of the metal connection post 2 a.
- the second insulator 9 is located between the second backplate 8 and the diaphragm 3 for connecting and supporting the edge portions thereof to make sure that the second backplate 8 and the diaphragm 3 are electrically insulated to each other.
- the second insulator 9 has a metal connection post 9 a which extends vertically through upper and lower surfaces thereof to electrically connect with the metal connection post 3 a and the metal connection post 8 c , and a metal shielding interlayer 9 b which is substantially parallel to the metal connection post 9 a and extends beyond the upper and lower surfaces thereof to electrically connect with the metal shielding interlayer 3 c and the metal shielding interlayer 8 b .
- the metal shielding interlayer 9 b should be located outside of the metal connection post 9 a.
- a first capacitor is formed by the metal film 1 b of the backplate 1 and the metal film 3 b of the diaphragm 3 which act as two electrodes of the first capacitor.
- a second capacitor is formed by the metal film 8 b of the backplate 8 and the metal film 3 b of the diaphragm 3 which acts as two electrodes of the second capacitor.
- the insulative spacer 4 is located below the second backplate 8 .
- the insulative 4 peripherally connect the diaphragm 3 with substrate 5 to form a back chamber which is acoustic airtight.
- the driving circuit element 6 is mounted on the substrate 5 and is accommodated by the back chamber.
- the electrostatic loudspeaker not only can effectively adjust the acoustic characteristic but also can achieve a small-size because of the structure of back chamber.
- Side walls of the insulative spacer 4 have a metal connection post 4 a , 4 a 1 and 4 c extending through upper and lower surfaces thereof and a metal shielding interlayer 4 b for protecting the metal connection post 4 a , 4 a 1 and 4 c .
- the metal connection posts 4 a 1 and 4 a are respectively connected with the metal connection posts 8 c of the second backplate 8 , while the metal connection post 4 c is electrically connected with the metal connection post 8 d of the second backplate 8 .
- the substrate 5 has a first metal layer 5 a which is located on the inner (upper) surface thereof, a second metal layer 5 b which is located on the outer (lower) surface thereof and a plurality of metal connection posts 5 c establishing an electrical connection between the first metal layer 5 a and the second metal layer 5 b.
- the driving circuit element 6 is mounted on the upper surface of the substrate 5 and establishes an electrical connection with the first metal layer 5 a via the metal wires 7 a , 7 b , 7 c , 7 d , 7 e and 7 f .
- the second metal layer 5 b is graphically divided into a plurality of electrode pads 5 d , 5 e , 5 f , 5 g etc, wherein the electrode pads 5 d and 5 g are defined as grounding pads.
- the electrostatic loudspeaker has three connection paths.
- the first connection path consists of two connection branch paths.
- the metal wire 7 a electrically connects with the first metal layer 5 a , the metal connection posts 4 a 1 , 3 a and 2 a to establish the first connection branch path.
- One part of the first metal layer 5 a which has relationship with the metal wire 7 a and electrically connects with the metal connection posts 4 c and 8 d establishes the second connection branch path.
- the metal wire 7 f electrically connects with the first metal layer 5 a and the metal connection post 4 a to establish the second connection path.
- the metal wires 7 c and 7 d electrically connects with the first metal layer 5 a and the metal connection posts 5 c to establish a third connection path.
- the driving circuit element 6 converts the electrical signals into driving signals.
- One road of the driving signals gets to the first metal film 1 b of the backplate 1 via the first connection branch path.
- Another road of the driving signals gets to the second metal film 8 a of the second backplate 8 via the second connection branch path.
- the threshold value of the sound power is increased and the structure is optimized.
- the other road of the driving signals gets to the metal film 3 b of the diaphragm 3 via the second connection path.
- the metal shielding layer 1 c , the metal shielding interlayer 1 d , 2 b , 3 c and 4 b , the second metal layer 5 b (grounding pads 5 d and 5 g ), some of the metal connection posts 5 c and the metal wires 7 b , 7 e are electrically connected together and jointly forms into the shielding case which encloses substantial parts or elements of the electrostatic loudspeaker to prevent them from exterior interference.
- the shielding case improves the performance of the electrostatic loudspeaker of the third embodiment, the scope of the present invention is not limited to the one having it.
- the electrostatic loudspeaker can be surface mounted because of special structure of the substrate 5 .
- the metal layer 5 b of the substrate 5 forms on the upper surface of the backplate or the first backplate 1 so that the backplate or the first backplate 1 can be surface mounted with zero height after increasing the number of the metal connection posts, and hereby, achieve the multi-surfaces mounted assembly function of electrostatic loudspeaker according to the present invention.
- the present invention is easy to be manufactured and assembled in a large quantity, and decrease the production cost.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
- 1. Field of the Invention
- The present invention relates to an electroacoustic transducer, and more particularly relates to a small or miniature electrostastic loudspeaker (ESL).
- 2. Description of Related Art
- Loudspeaker is an electroacoustic transducer for changing electrical signals into sound. The loudspeaker pushes a medium in accord with the pulsations of an electrical signal, thus causing sound waves to propagate to where they can then be received by the ear. According to the different physical effects of the electroacoustic conversion, the loudspeakers are divided into many kinds of types, such as magnetic loudspeaker, piezoelectric loudspeaker, electrostatic loudspeaker (condenser loudspeaker) and moving-coil loudspeaker (dynamic loudspeaker). Each type of the loudspeaker has advantages and disadvantages. In recent years, the moving-coil loudspeaker has been widely used because of the advantages in relatively great variety and mature manufacturing process.
- The loudspeakers are almost applied in each kind of electrical consumer products. With the development of use in portable consumer products for audio communication and audio/video playing, such as walkman, cell phone, the market of the loudspeaker which is recognized as the key part of the consumer products becomes larger and larger.
- At present, the moving-coil loudspeaker takes up a large share of the market. The moving-coil loudspeaker has a vibration system and magnetic system. The vibration system is operated by the electro-magnetic interaction to produce mechanical movement, and further radiate sound-waves into air. However, the vibration system has a heavy quality which limits the application of the moving-coil loudspeaker in the portable products. In addition, the frequency response is not flat and has worse performance in high-range frequency.
- The electrostatic loudspeaker mainly has a diaphragm and stationary electrode which forms a capacitor with the diaphragm. The electrostatic loudspeaker is driven by the static-electricity on the capacitor to work. When the electrostatic loudspeaker works, the capacitor electrically connects with a pair of power sources to polarize the two electrodes, the diaphragm and stationary electrode, to produce an electrostatic field therebetween. When audio signals are inputted, the diaphragm is driven by the signal currents supplied by the electrostatic field to vibrate and sound, and then radiate sound-waves to exterior through sound apertures located on the stationary electrode.
- The electrostatic loudspeaker adopts the static-driven vibration system which is light and thin without the coils and the like elements in the moving-coil loudspeaker. Therefore, the electrostatic loudspeaker can expand the high frequency characteristic, and meanwhile improve the flatness of the frequency response. The electrostatic loudspeaker also has an advantage of small distortion. Conclusively, the structure of the electrostatic loudspeaker is easy to be small-sized and light, and is in accordance with the development trend of electrical consumer products.
- According to one aspect of the present invention, an electrostatic loudspeaker includes: a backplate having a metal film acting as one electrode of a capacitor and defining a plurality of sound apertures therein; a diaphragm spaced a distance from the backplate insulatively to form the capacitor; the diaphragm comprising a metal film acting as the other electrode of the capacitor; a back chamber having a substrate and an insulative spacer for joining edge portions of the diaphragm and the substrate; a driving circuit element for converting electrical signals from exterior input pads into driving signals to drive the diaphragm to vibrate and sound; the driving circuit element being mounted on an inner surface of the substrate and being accommodated in the back chamber; and a first, second and third connection paths for respectively electrically connecting the driving circuit element with the two electrodes of the capacitor, and the exterior input pads.
- According to another aspect of the present invention, an electrostatic loudspeaker includes: a first and second backplates each having a metal film; a diaphragm being sandwiched between the first and second backplates and having a metal film which forms a first capacitor with the metal film of the first backplate and forms a second capacitor with the metal film of the second backplate; the metal films of the first and second backplates being applied inverse voltage when the electrostatic loud speaking working; a substrate being located below the diaphragm; a driving circuit element being mounted on the substrate for converting electrical signals from exterior input pads into driving signal to drive the diaphragm to vibrate and sound; a plurality of connection paths respectively for electrically connecting the driving circuit element with the metal films of the first backplate, the second backplate and diaphragm, and the exterior input pads; and a shielding case enclosing the connection paths therein.
- According to the other aspect of the present invention, an electrostatic loudspeaker includes: first and second backplates each having a metal film; a diaphragm being sandwiched between the first and second backplates and having a metal film which forms a first capacitor with the metal film of the first backplate and forms a second capacitor with the metal film of the second backplate; a back chamber having a substrate and an insulative spacer for joining edge portions of the second backplate and the substrate; the substrate having a first metal layer which is formed on an inner surface of the substrate and divided into several separate parts being electrically insulative to each other; a driving circuit element for converting electrical signals into driving signals to drive the diaphragm to vibrate and sound; the driving circuit element being mounted on the inner surface of the substrate and being accommodated in the back chamber; a plurality of metal connection posts extending through the diaphragm, the second backplate, the insulative space and the substrate; the metal connection posts of the diaphragm, the second backplate, and the insulative space electrically connecting with some of the separate parts of the first metal layer to establish one connection path; the connection post of the insulative space electrically connecting with another some of the separate parts of the first metal layer to establish another connection path; the connecting posts of the substrate electrically connecting with the other some of the separate parts of the first metal layer to establish other connection path. The one connection path and the another connection path provides inverse voltage to the metal films of the first and second backplates from the driving circuit element.
- The foregoing has outlined rather broadly the features and technical advantages of the present invention in order that the detailed description of the invention that follows may be better understood. Additional features and advantages of the invention will be described hereinafter which form the subject of the claims of the invention.
- For a more complete understanding of the present invention, and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a schematic perspective view of an electrostatic loudspeaker according to a first embodiment of the present invention; -
FIG. 2 is a cross-sectional view of the electrostatic loudspeaker shown inFIG. 1 ; -
FIG. 3 is a schematic cross-sectional view of an electrostatic loudspeaker according to a second embodiment of the present invention; and -
FIG. 4 is a schematic cross-sectional view of an electrostatic loudspeaker according to a third embodiment of the present invention. - In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention. The drawings and detail description of several embodiments are considered as an exemplification of the principles of the present invention and are not intended to limit the scope of the invention to the embodiments illustrated. Besides, these drawings schematically illustrate the embodiments of the present invention, and the dimension and proportion of elements are not intended to limit the structure of the present invention.
- Referring to
FIGS. 1 to 2 , an electrostatic loudspeaker according to the first embodiment of the present invention is provided. The electrostatic loudspeaker has abackplate 1, adiaphragm 3, aninsulator 2, aninsulative spacer 4, asubstrate 5, a plurality of metal wires 7 and a plurality of metal connection posts. Thebackplate 1, theinsulative spacer 4 and thesubstrate 5 are mainly formed by insulative materials, such as FR-4, G10, BT. Thebackplate 1 opens a plurality of sound apertures 1 a through which sound waves are radiated to exterior when thediaphragm 3 being driven to vibrate and sound. Further, the size, amount, shape and arrangement of the sound apertures 1 a are determined depending on the acoustic characteristic requirements, for example, the sound apertures 1 a can be shaped in round or rectangle. - The
backplate 1 has the base material and ametal film 1 b. Themetal film 1 b is formed on an inner surface of thebackplate 1. Thediaphragm 3 has a base film and ametal film 3 b, and the base film is formed by organic film, such as PTE, PE, PVC, PTFE. Theinsulator 2 is located between thebackplate 1 and thediaphragm 3 for connecting and supporting the edge portions thereof to make sure that thebackplate 1 and thediaphragm 3 are electrically insulated to each other. In such configuration, a capacitor is formed and themetal film 1 b of thebackplate 1 and themetal film 3 b of thediaphragm 3 act as two electrodes of the capacitor. - Specially referring to
FIG. 2 , thediaphragm 3 further has ametal connection post 3 a extending vertically through upper and lower surfaces thereof. One side wall of theinsulator 2 also has ametal connection post 2 a which extends vertically through upper and lower surfaces thereof to electrically connect with themetal connection post 3 a of thediaphragm 3. - The
insulative spacer 4 is opposite to thebackplate 1 and peripherally connects thediaphragm 3 withsubstrate 5 to form a back chamber which is acoustic airtight. Adriving circuit element 6 is mounted on thesubstrate 5 and is accommodated by the back chamber. The electrostatic loudspeaker not only can effectively adjust the acoustic characteristic but also can achieve a small-size because of the structure of back chamber. - Further, two opposite side walls of the
insulative spacer 4 respectively have ametal connection post metal connection post 4 a 1 is electrically connected with themetal connection post 3 a of thediaphragm 3, while themetal connection post 4 a is electrically connected with themetal film 3 b of thediaphragm 3. - The
substrate 5 has afirst metal layer 5 a which is located on the inner (upper) surface thereof and asecond metal layer 5 b which is located on the outer (lower) surface thereof. Thesecond metal layer 5 b has several pads some of which function as exterior input pads of the whole electrostatic loudspeaker. Thesubstrate 5 further has a plurality ofmetal connection posts 5 c extending through the upper and lower surfaces thereof to establish an electrical connection between thefirst metal layer 5 a and thesecond metal layer 5 b. - As above-mentioned, the
driving circuit element 6 is mounted on the upper surface of thesubstrate 5 and establishes an electrical connection with thefirst metal layer 5 a via themetal wires first metal layer 5 contacting with themetal wires metal wiring second metal layer 5 b, themetal connection posts 5 c, the third part of thefirst metal layer 5 a and themetal wires circuit element 6 receives the input electrical signals and converts them into driving signals. One road of the driving signals are transmitted through themetal wire 7 a, the first part of thefirst metal layer 5 a, themetal connection post 4 a 1 of theinsulative spacer 4, theconnection post 3 a of thediaphragm 3, theconnection post 2 a (another connection path) and finally get to themetal film 1 b of thebackplate 1; the other road of the driving signals are transmitted through themetal wire 7 c, the second part of thefirst metal layer 5 a, theconnection post 4 a of the insulative spacer 4 (the other connection path) and finally get to themetal film 3 b of thediaphragm 3. As a result, the two electrodes (thebackplate 1 and diaphragm 3) respectively establish an electrical connection with the drivingcircuit element 6. The two electrodes are polarized to produce an electrostatic filed to drive thediaphragm 3 to vibrate and sound. The sound is radiated out through the sound apertures 1 a. Hereby, the function of the electrostatic loudspeaker is wholly achieved. - Referring to
FIG. 3 , another electrostatic loudspeaker according to the second embodiment of the present invention is disclosed. Comparing to the first embodiment of the present invention, the electrostatic loudspeaker of the second embodiment further has a shielding case to prevent connections paths from the electromagnetic interference. - The electrostatic loudspeaker has a
backplate 1, adiaphragm 3, aninsulator 2, ainsulative spacer 4, asubstrate 5, the shielding case, a plurality of metal wires 7 and a plurality of metal connection posts. Thebackplate 1, theinsulative spacer 4 and thesubstrate 5 are mainly formed by insulative materials, such as FR-4, G10, BT. Thebackplate 1 opens a plurality of sound apertures 1 a through which sound waves are radiated to exterior when thediaphragm 3 being driven to vibrate and sound. Further, the size, amount, shape and arrangement of the sound apertures 1 a are determined depending on the acoustic characteristic requirements, for example, the sound apertures 1 a can be shaped in round or rectangle. - The
backplate 1 has the base material and ametal film 1 b. Themetal film 1 b is formed on an inner surface of thebackplate 1. Thediaphragm 3 has a base film and ametal film 3 b, and the base film is formed by organic film, such as PTE, PE, PVC, PTFE. Theinsulator 2 is located between thebackplate 1 and thediaphragm 3 for connecting and supporting the edge portions thereof to make sure that thebackplate 1 and thediaphragm 3 are electrically insulated to each other. In such configuration, a capacitor is formed and themetal film 1 b of thebackplate 1 and themetal film 3 b of thediaphragm 3 act as two electrodes of the capacitor. Thebackplate 1 further has ametal shielding layer 1 c covering an upper (outer) surface thereof and ametal shielding interlayer 1 d which extends through the upper and lower surfaces thereof to electrically connect with themetal shielding layer 1 c. It should be known that themetal film 1 b and themetal shielding layer 1 c can be made of cuprum, aurum, nickel or the like materials. - The
diaphragm 3 further has ametal connection post 3 a extending vertically through upper and lower surfaces thereof. One side wall of theinsulator 2 also has ametal connection post 2 a which extends vertically through upper and lower surfaces thereof to electrically connect with themetal connection post 3 a of thediaphragm 3. Thediaphragm 3 further has ametal shielding interlayer 3 c. - Besides the
metal connection post 2 a, theinsulator 2 has ametal shielding interlayer 2 b which extends vertically through upper and lower surfaces thereof to electrically connect with themetal shielding interlayer 3 c and themetal shielding interlayer 1 d. Furthermore, themetal shielding interlayer 2 b should be located outside of themetal connection post 2 a. - The
insulative spacer 4 is opposite to thebackplate 1 and peripherally connects thediaphragm 3 with thesubstrate 5 to form a back chamber which is acoustic airtight. A drivingcircuit element 6 is mounted on thesubstrate 5 and is accommodated by the back chamber. The electrostatic loudspeaker not only can effectively adjust the acoustic characteristic but also can achieve a small-size because of the structure of back chamber. - Further, two opposite side walls of the
insulative spacer 4 respectively have ametal connection post metal shielding interlayer 4 b correspondingly protecting theconnection post 4 a and theconnection post 4 a 1. The connection post 4 a 1 is electrically connected with theconnection post 3 a of thediaphragm 3, while theconnection post 4 a is electrically connected with themetal film 3 b of thediaphragm 3. - The
substrate 5 has afirst metal layer 5 a which is located on inner the (upper) surface thereof, asecond metal layer 5 b which is located on the outer (lower) surface thereof and a plurality ofmetal connection posts 5 c establishing an electrical connection between thefirst metal layer 5 a and thesecond metal layer 5 b. The drivingcircuit element 6 is mounted on the upper surface of thesubstrate 5 and establishes an electrical connection with thefirst metal layer 5 a via themetal wires first metal layer 5 for contacting with themetal wires second metal layer 5 b is graphically divided into a plurality ofelectrode pads electrode pad metal wire 7 a electrically connects with thefirst metal layer 5 a, themetal connection posts 4 a 1, 3 a and 2 a to establish a first connection path. Themetal wire 7 f electrically connects with thefirst metal layer 5 a and themetal connection post 4 a to establish a second connection path. Themetal wires first metal layer 5 a and the connection posts 5 c to establish a third connection path. When electrical signals are inputted from theelectrode pads circuit element 6 via the third connection path. The drivingcircuit element 6 converts the electrical signals into driving signals. One road of the driving signals gets to themetal film 1 b of thebackplate 1 via the first connection path. The other road of the driving signals gets to themetal film 3 b of thediaphragm 3 via the second connection path. As a result, the two electrodes (thebackplate 1 and diaphragm 3) respectively establish electrical connection with drivingcircuit element 5. The two electrodes are polarized to produce an electrostatic filed to drive thediaphragm 3 to vibrate and sound. The sound is radiated out through the sound apertures 1 a. Hereby, the function of the electrostatic loudspeaker is wholly achieved. Themetal shielding layer 1 c, themetal shielding interlayer second metal layer 5 b (thegrounding pads metal connection posts 5 c and themetal wires - As shown in
FIG. 4 , another electrostatic loudspeaker according to the third embodiment of the present invention is disclosed. The electrostatic loudspeaker has afirst backplate 1, adiaphragm 3, afirst insulator 2, aninsulative spacer 4, asubstrate 5, and adriving circuit element 6, a plurality of metal wires 7, asecond backplate 8, asecond insulator 9, a shielding case, and a plurality of metal connection posts. It is noted that thefirst backplate 1 is the same as thebackplate 1 in the first and second embodiments. Using the different term to indicate the same part is not intended to confuse the skilled person in this art, but conveniently describe the third embodiment of the present invention. Thediaphragm 3 is sandwiched between thefirst backplate 1 and thesecond backplate 2. When the electrostatic loudspeaker working, thefirst backplate 1 and thesecond backplate 2 are applied inverse voltage so that they seldom adhesively contacts with thediaphragm 3 with the radiated sound power is improved. - The
first backplate 1, thesecond backplate 8, thefirst insulator 2, thesecond insulator 9, theinsulative spacer 4 and thesubstrate 5 are mainly formed by insulative materials, such as FR-4, G10, BT. Both of thebackplates sound apertures 1 a, 8 a through which sound waves are radiated to exterior when thediaphragm 3 being driven to vibrate and sound. Further, the size, amount, shape and arrangement of thesound apertures 1 a, 8 a are determined depending on the acoustic characteristic requirements, for example, thesound apertures 1 a, 8 a can be shaped in round or rectangle. - The
first backplate 1 has afirst metal film 1 b which formed on an inner surface of thefirst backplate 1. Thefirst metal film 1 b is the same as themetal film 1 b in the first and second embodiments. Thefirst backplate 1 further has ametal shielding layer 1 c covering an upper (outer) surface thereof and ametal shielding interlayer 1 d which extends through the upper and lower surfaces thereof to electrically connect with themetal shielding layer 1 c. It should be known that themetal film 1 b and themetal shielding layer 1 c can be made of cuprum, aurum, nickel or the like materials. Thesecond backplate 8 has asecond metal film 8 a which is formed on an upper surface thereof. The first andsecond metal films 1 a, 8 a are applied inverse voltage, and they corporately drive thediaphragm 3 to vibrate and sound in a higher driving power and fewer adhesive contacts among them. Thesecond backplate 8 further has ametal shielding interlayer 8 b andmetal connection posts connection post 8 d electrically contact with thesecond metal film 8 a. - The
diaphragm 3 has a base film, ametal film 3 b, ametal connection post 3 a extending vertically through upper and lower surfaces thereof and ametal shielding interlayer 3 c. The base film is formed by organic film, such as PTE, PE, PVC and PTFE. - The
first insulator 2 is located between thefirst backplate 1 and thediaphragm 3 for connecting and supporting the edge portions thereof to make sure that thefirst backplate 1 and thediaphragm 3 are electrically insulated to each other. Thefirst insulator 2 has ametal connection post 2 a which extends vertically through upper and lower surfaces thereof to electrically connect with themetal connection post 3 a, and ametal shielding interlayer 2 b which is substantially parallel to themetal connection post 2 a and extends beyond the upper and lower surfaces thereof to electrically connect with themetal shielding interlayer 3 c and themetal shielding layer 1 d. Furthermore, themetal shielding interlayer 2 b should be located outside of themetal connection post 2 a. - The
second insulator 9 is located between thesecond backplate 8 and thediaphragm 3 for connecting and supporting the edge portions thereof to make sure that thesecond backplate 8 and thediaphragm 3 are electrically insulated to each other. Thesecond insulator 9 has ametal connection post 9 a which extends vertically through upper and lower surfaces thereof to electrically connect with themetal connection post 3 a and themetal connection post 8 c, and ametal shielding interlayer 9 b which is substantially parallel to themetal connection post 9 a and extends beyond the upper and lower surfaces thereof to electrically connect with themetal shielding interlayer 3 c and themetal shielding interlayer 8 b. Furthermore, themetal shielding interlayer 9 b should be located outside of themetal connection post 9 a. - In such configuration, a first capacitor is formed by the
metal film 1 b of thebackplate 1 and themetal film 3 b of thediaphragm 3 which act as two electrodes of the first capacitor. A second capacitor is formed by themetal film 8 b of thebackplate 8 and themetal film 3 b of thediaphragm 3 which acts as two electrodes of the second capacitor. - The
insulative spacer 4 is located below thesecond backplate 8. Theinsulative 4 peripherally connect thediaphragm 3 withsubstrate 5 to form a back chamber which is acoustic airtight. The drivingcircuit element 6 is mounted on thesubstrate 5 and is accommodated by the back chamber. The electrostatic loudspeaker not only can effectively adjust the acoustic characteristic but also can achieve a small-size because of the structure of back chamber. Side walls of theinsulative spacer 4 have ametal connection post metal shielding interlayer 4 b for protecting themetal connection post metal connection posts 4 a 1 and 4 a are respectively connected with themetal connection posts 8 c of thesecond backplate 8, while themetal connection post 4 c is electrically connected with themetal connection post 8 d of thesecond backplate 8. - The
substrate 5 has afirst metal layer 5 a which is located on the inner (upper) surface thereof, asecond metal layer 5 b which is located on the outer (lower) surface thereof and a plurality ofmetal connection posts 5 c establishing an electrical connection between thefirst metal layer 5 a and thesecond metal layer 5 b. - The driving
circuit element 6 is mounted on the upper surface of thesubstrate 5 and establishes an electrical connection with thefirst metal layer 5 a via themetal wires first metal layer 5 for contacting themetal wires second metal layer 5 b is graphically divided into a plurality ofelectrode pads electrode pads metal wire 7 a electrically connects with thefirst metal layer 5 a, themetal connection posts 4 a 1, 3 a and 2 a to establish the first connection branch path. One part of thefirst metal layer 5 a which has relationship with themetal wire 7 a and electrically connects with themetal connection posts metal wire 7 f electrically connects with thefirst metal layer 5 a and themetal connection post 4 a to establish the second connection path. Themetal wires first metal layer 5 a and themetal connection posts 5 c to establish a third connection path. When electrical signals are inputted from theelectrode pads circuit element 6 via the third connection path. The drivingcircuit element 6 converts the electrical signals into driving signals. One road of the driving signals gets to thefirst metal film 1 b of thebackplate 1 via the first connection branch path. Another road of the driving signals gets to thesecond metal film 8 a of thesecond backplate 8 via the second connection branch path. For the inverse voltage are applied to the twobackplates metal film 3 b of thediaphragm 3 via the second connection path. Themetal shielding layer 1 c, themetal shielding interlayer second metal layer 5 b (grounding pads metal connection posts 5 c and themetal wires - In addition, the electrostatic loudspeaker can be surface mounted because of special structure of the
substrate 5. As an alternative, themetal layer 5 b of thesubstrate 5 forms on the upper surface of the backplate or thefirst backplate 1 so that the backplate or thefirst backplate 1 can be surface mounted with zero height after increasing the number of the metal connection posts, and hereby, achieve the multi-surfaces mounted assembly function of electrostatic loudspeaker according to the present invention. For this kind of structure, the present invention is easy to be manufactured and assembled in a large quantity, and decrease the production cost. - While specific embodiments have been illustrated and described, numerous modifications come to mind without significantly departing from the spirit of the invention and the scope of protection is only limited by the scope of the accompanying claims.
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CN200910160443.6A CN101959105B (en) | 2009-07-12 | 2009-07-12 | Electrostatic loudspeaker |
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CN200910160443.6 | 2009-07-12 |
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Cited By (3)
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US20190215591A1 (en) * | 2016-08-18 | 2019-07-11 | Harman International Industries, Incorporated | Electret condenser microphone and manufacturing method thereof |
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CN102745640B (en) * | 2011-04-22 | 2015-04-15 | 欣兴电子股份有限公司 | Covering member for micro electro mechanical device and manufacturing method thereof |
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US8103028B2 (en) | 2012-01-24 |
CN101959105B (en) | 2014-01-15 |
CN101959105A (en) | 2011-01-26 |
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